Indexed by:期刊论文

Date of Publication:2009-03-01

Journal:ELECTROCHIMICA ACTA

Included Journals:SCIE

Volume:54

Issue:8

Page Number:2224-2228

ISSN No.:0013-4686

Key Words:1,5-Diaminoanthraquinone; Oxygen reduction; Electron-transfer resistance; O(2)-transport; Electrocatalysis

Abstract:The poly-1,5-diaminoanthraquinone (P15DAAQ) modified Pt electrodes show electrocatalytic activity for oxygen reduction reaction (ORR) with oxygen reduction peak at about 0.39V in 0.1 MH(2)SO(4). The P15DAAQ with different thickness has different morphology. The effects of morphologies on the electrocatalytic behaviors of P15DAAQ for oxygen reduction reaction are investigated using cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) measurements. We propose two different O(2)-transport processes on electrodes modified with thin P15DAAQ and thick P15DAAQ. Together with the quantitative analysis with O(2)-transport dynamics, electron-transfer resistance, and catalytic reaction rate during ORR, thin P15DAAQ electrode performs better electrocatalysis for ORR, although thick P15DAAQ provides higher real surface area and more reactive sites which is beneficial for ORR within a short time. (C) 2008 Elsevier Ltd. All rights reserved.